odd problem

[Cosmology27]

So I've realized my problem is worse than I thought.

I have two computers, a mac and a pc, and it's happening on both of them.

My modpack I've made installs and loads up properly, but when I'm in a world, I can't open the inventory when I press "E". I get the achievement, because the game recognizes I pushed "E".

I'm really confused by this all. Any ideas?

Edited October 20, 2016 by Cosmology27